Question

我正在尝试编写一个带字符串的函数（格式为“dd MM yyyy”）并返回给定参数之后的第二天。

例如：

let nextDay = getNextDay("31 12 2016")
print(nextDay)

会打印：

01 01 2017

有人可以告诉我该怎么做吗？感谢

Answer 1

以下代码段可以为您提供帮助。

//Call method like this

convertNextDate(dateString: "31 12 2016")


// Method is here

func convertNextDate(dateString : String){    
    let dateFormatter = DateFormatter()
    dateFormatter.dateFormat = "dd MM yyyy"
    let myDate = dateFormatter.date(from: dateString)!
    let tomorrow = Calendar.current.date(byAdding: .day, value: 1, to: myDate)
    let somedateString = dateFormatter.string(from: tomorrow!)
    print("your next Date is \(somedateString)")
}

Answer 2

class DateHelper
{

  lazy var formatter:DateFormatter = {
  let formatter = DateFormatter()
  formatter.dateFormat = "dd MM yyyy"
  return formatter
}()

  lazy var dateComponents:DateComponents = {
  var dateComp = DateComponents()
  dateComp.day = 1
  return dateComp
}()

  func getNext(dateString:String) -> String?
  {
    if let date     =  self.formatter.date(from: dateString),
       let nextDate = Calendar.current.date(byAdding: self.dateComponents, to: date)
    {
      return self.formatter.string(from: nextDate)
    }
    return nil
  }
}

DateHelper().getNext(dateString: "31 12 2016")

斯威夫特 - 获取下一个约会

2 个答案: